b'QUESTIONS&ANSWERS Q:WHAT ARE THE RECOMMENDEDthe surfacing material. FELT UNDERLAVMENT REQUIREMENTSWhereas, a blister is an UNDER FIBERGLASS AND ORGANICenclosed pocket of air ASPHALT SHINGLES?mixed with watersolvent or vapor that is trapped A:When asphalt shingles are used on roofs withbetween impermeable layslopes ofinches orone layer of minimum No. 15ers ofin a built-up roof, fourmore,felt felt should be applied.The sheets should be applied hori or between the felt and the zontally and should be lapped a minimum of two inches oversubstrate. the preceding felt sheet.On roofs with slopes between three to 31inches per foot, two layers of No. 15 feltQ:\\IVHAT DOES /2 the~should be applied toroof decking steep asphalt or_THE TERM_ ul;NYf_mastic to a point 24" from inside ofThisLOPE" MEAN IN A extension wall. double coverage is accomplished by overlapping each sheetBUILT-UP ROOFSYS19 inches overpreceding sheet.Asphalt shingles may theTEM? be used on roof slopes between two to three inches per foot when a hot roof underlayment orbituminous newA:An envelope is a conunderlayment is used.When asphalt shingles are applied over an existing roof, however, no underlayment is requiredtinuous membrane edge as the existing roofseal formed at the perimeadequately serves as the underlayment. terand at penetraQ:\\IVHAT IS THE DIFFERENCE BETWEENuALLI tions by folding the base sheet orover the plies ply By MRCA TechnicalGATORING" AND uBLISTERING\'?"above and securing it to Consultant Bob Lacossethe top of the membrane. A:Alligatoring is the cracking ofsurfacing bitumen onThe envelope prevents the a built-up roof, producing a pattern ofto anbitumen seepage from the cracks similar alligator\'s hide.The cracks may or may not extend throughedge ofmembrane. the CONVENTIONCOUNTDOWNContinued frorn Page7 includes Paul and his bluesuppliers will host hospitali- their imagination and initia-ox Babe, head waters ofty suites on anothertive designing this part of -the-mighty-Mississrpp\'\'evening:-lrsa-greatwayt - conventrorr:- - ~u t,lte canoes, tee-pees, birchvisit in a casual atmos-and pine trees and the like.phere.With all ofabove to the We\'ll have a logger buffetexperience, I am sure this with all the trimmings toA varied Spouse/Guestyear will be a resounding satisfy every size appetite.Program has been orga success.Make your plans Need to work offbignized for attendees.now to attend and get that meal?Try some line danc Included are a Twin Citiesready to experience some ing or circle dancing leadhighlight tour, a shoppingreal northern hospitality. by a professional danceextravaganza at the famousSee you soon! America, an caller.There will also beMall ofoppornerftunity for self indulgence at archery, log jousting, a scavenger hunt, not tothe "Salon Experience," mention fishing for real liveand an informative, fun, and trout!tasty presentation on healthy cooking.My Also remember that vari thanks to my wife Nancy ous manufacturers andand Sue Schwickert for'